Experimental Visibility Rating, HRRR smoke forecast for 28-01-2022 03PDT

Product
Forecast Hour (forecasts 00,06,12,18 go out to hour 48, others to hour 18)
Surface
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
1000ft
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
6000ft
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Experimental Surface Smoke, HRRR smoke forecast for 28-01-2022 03PDT

Product
Forecast Hour (forecasts 00,06,12,18 go out to hour 48, others to hour 18)
Surface
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Last 6-hourly Visibility forecast for 27-01-2022 23PDT

Product
Forecast Hour
Surface
1000ft
6000ft

Last 6-hourly Smoke forecast for 27-01-2022 23PDT

Product
Forecast Hour
Surface



HRRR visibility product description:
This product is derived from NOAA/NWS HRRR smoke hourly Rapid Refresh updates to support current California wildfire operations. Visibility is calculated by DRI-CEFA-CANSAC based on Malm and Schichtel (2013). Forecasted concentrations of PM2.5 are converted to visibility (in miles AGL) using the algorithm Visual Range (VR) = 870/PM2.5.
Reference: Malm, W.C. and B.A. Schichtel, 2013: Uncertainty associated with estimating a short-term (1-3 hr) particulate matter concentration from a human-sighted visual range. Final report to the Joint Fire Science Program (13-C-01-01).